Patents by Inventor William O. Smith

William O. Smith has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Mathematical game apparatus
    Patent number: 4452588
    Abstract: An apparatus for generating arithmetic expressions is disclosed. It comprises sets of number dice and of operator dice. The number dice are provided in two different colors, in order to remove ambiguity arising from the non-cumulative operations of subtraction and division, and to provide a means of designating negative numbers if so desired.
    Type: Grant
    Filed: June 16, 1983
    Date of Patent: June 5, 1984
    Inventor: William O. Smith